The world's most ambitious scientific experiment is buried 100 meters underground, straddling Switzerland and France. A billion times every minute, the Large Hadron Collider (LHC) slams together protons, while four giant detectors watch closely.

Just as there is adifference between knowing how to *drive* a car and understanding itsfunctioning well enough to fix it when it breaks down, so too is there adifference between knowing how to *use* quantum theory to makepredictions and understanding what it says about the world well enough to seehow it might fail or how it might be usefully generalized. The field of quantumfoundations seeks to achieve such a deeper understanding. In particular, it

For the first time in human thought it is nowpossible to observationally determine how much matter is in the Universe as awhole. These observations strongly support the “Concordance Model” of Hot BigBang Cosmology, and reinforce earlier indications that ordinary matter (atoms,nuclei and electrons) make up at present at most 4% of the total of theUniversal energy density. The big surprise was that the rest consists of *two*kinds of unknown forms of matter: the so-called Dark Matter and Dark Energy.